/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute;

import proguard.classfile.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.visitor.ClassVisitor;

/**
 * This Attribute represents a signature attribute.
 *
 * @author Eric Lafortune
 */
public class SignatureAttribute extends Attribute {
    public int u2signatureIndex;

    /**
     * An extra field containing all the classes referenced in the signature string. This field is filled out by the
     * {@link proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}. The size of the array is the
     * number of classes in the signature. Primitive types and arrays of primitive types are ignored. Unknown classes
     * are represented as null values.
     */
    public Clazz[] referencedClasses;

    /**
     * Creates an uninitialized SignatureAttribute.
     */
    public SignatureAttribute() {}

    /**
     * Creates an initialized SignatureAttribute.
     */
    public SignatureAttribute(int u2attributeNameIndex, int u2signatureIndex) {
        super(u2attributeNameIndex);

        this.u2signatureIndex = u2signatureIndex;
    }

    /**
     * Returns the signature.
     */
    public String getSignature(Clazz clazz) {
        return clazz.getString(u2signatureIndex);
    }

    /**
     * Lets the Clazz objects referenced in the signature string accept the given visitor.
     */
    public void referencedClassesAccept(ClassVisitor classVisitor) {
        if (referencedClasses != null) {
            for (int index = 0; index < referencedClasses.length; index++) {
                if (referencedClasses[index] != null) {
                    referencedClasses[index].accept(classVisitor);
                }
            }
        }
    }

    // Implementations for Attribute.

    public void accept(Clazz clazz, AttributeVisitor attributeVisitor) {
        attributeVisitor.visitSignatureAttribute(clazz, this);
    }

    public void accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor) {
        attributeVisitor.visitSignatureAttribute(clazz, field, this);
    }

    public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor) {
        attributeVisitor.visitSignatureAttribute(clazz, method, this);
    }
}
